3J21 Constant Elasticity Alloy Wire, Precision Micro-wire for Instrumentation
Professional supplier of 3J1 constant elasticity alloy fine wire with low elastic modulus temperature coefficient and dimensional tolerance of ±0.005mm.
Material Overview
3J21 is a cobalt-based constant-elasticity alloy wire with excellent elastic properties and dimensional stability. Its modulus of elasticity has an extremely low temperature coefficient, changing by less than 0.01% between -50°C and +100°C, making it an ideal material for precision elastic components.
3J21 alloy wire is produced via vacuum induction melting, followed by multi-pass cold drawing and aging treatment to ensure uniform microstructure and consistent mechanical properties. Its high surface finish and non-magnetic characteristics make it ideal for precision instruments sensitive to magnetic fields.
Chemical Composition and Mechanical Properties
Chemical Composition of 3J21 Alloy Wire (Mass Fraction %)
| Element | Content Range |
|---|---|
| Co | Remaining |
| Cr | 19.0-21.0 |
| Hi | 9.0-11.0 |
| Mo | 6.0-8.0 |
| It | 1.8-2.2 |
| C | ≤0.08 |
| Fe | ≤1.00 |
Mechanical Properties of 3J21 Alloy Wire
Tensile Strength
≥1100 MPa
Yield Strength
≥650 MPa
Elongation
≥10%
Density
8.35 g/cm³
Temperature Coefficient of Elastic Modulus
<0.01%/°C (-50~100°C)
Available Wire Specifications
Wire diameter range
0.08mm - 2.0mm
Delivery Status
Hard-drawn (cold-drawn) / Annealed
Packaging Format
Coiled / Straight (Cut-to-Length)
Execution Standard
GB/T 15018
Core Product Advantages
Excellent constant elasticity performance
The temperature coefficient of the elastic modulus is extremely low, ensuring stable elastic performance across a wide temperature range.
Non-magnetic
Completely non-magnetic; ideal for precision instruments and electronic devices sensitive to magnetic fields.
Excellent corrosion resistance
Cobalt alloy properties provide excellent resistance to acid and alkali corrosion.
High dimensional accuracy
Wire diameter tolerance controlled within ±0.005mm, meeting precision component manufacturing requirements.
Industries
- Precision instrument elastic sensitive elements, diaphragms, and bellows
- sensor springs, resonators, delay lines
- Precision Elastic Components for Medical Devices
- Elastic components for precision instruments in aerospace
Processing & Delivery
Complementary Services
- Wire straightening
- Custom Slitting to Length
- Provide 3.1 material certification
- Technical Support & Material Selection Consultation
Delivery Timeline
Standard specifications in stock; ships in 3-5 business days. Custom special specifications require production; lead time is 7-15 business days. Nationwide delivery supported; expedited service available.
Frequently Asked Questions (FAQ)
What precision components is 3J21 elastic wire suitable for manufacturing?
3J21 constant-elasticity alloy wire is ideal for manufacturing elastic sensitive components, diaphragms, bellows, sensor springs, resonators, and delay lines in precision instruments. Its constant elasticity and non-magnetic properties make it a perfect material for high-precision measuring devices.
What is the heat treatment process for 3J21 wire?
3J21 wire typically undergoes a heat treatment process consisting of solution treatment followed by aging. The solution treatment temperature is approximately 1150°C, and the aging temperature ranges from 600 to 700°C. Soaking time is adjusted based on wire diameter. Proper heat treatment is critical for achieving consistent elastic properties.
What is the minimum wire diameter available for 3J21 alloy wire?
3J21 alloy wire is available with a minimum diameter of 0.08mm, meeting the manufacturing requirements for precision elastic components and micro springs. Wire diameter tolerance is controlled within ±0.005mm, and surface finish achieves Ra ≤ 0.4 μm.
What is the modulus of elasticity for 3J21 wire?
The elastic modulus of 3J21 alloy wire is approximately 200-220 GPa, and its variation rate within the temperature range of -50°C to +100°C is less than 0.01%. This is a core characteristic that makes it an invariant elasticity alloy.
Need 3J21 constant-elasticity alloy wire? Get a quote now.
Our expert team provides material selection guidance, specification confirmation, and fast quoting services.
Get in Touch